混合梁斜拉桥钢混结合段力学行为分析  

Mechanical Behavior Analysis of Steel-Concrete Bonding Section of Cable-Stayed Bridge with Mixed Beam

作　　者：严来章 YAN Laizhang(China Railway 24^(th) Bureau Group Anhui Engineering Co.Ltd.,Hefei Anhui 230011,China)

机构地区：[1]中铁二十四局集团安徽工程有限公司,安徽合肥230011

出　　处：《铁道建筑技术》2022年第4期28-31,82,共5页Railway Construction Technology

基　　金：中铁二十四局集团有限公司科技研发项目(2019-02)。

摘　　要：为研究独塔混合梁斜拉桥钢混结合段在成桥及施工阶段受力性能,以文昌西路斜拉桥为背景,采用有限元方法对斜拉桥钢混结合段进行精确化建模,对结构关键施工阶段受力性能进行重点分析。结果表明:钢结构部分总体受力合理,峰值应力出现在承压板与钢梁各构件交界处,埋入段钢梁折角处出现局部应力集中;钢板的存在破坏了混凝土的整体性,降低了其受力性能;剪力钉纵向剪力值沿纵向呈两头大、中间小的马鞍形分布;桥面板、承压板、钢梁传力比例较为接近,传力性能满足要求。In order to study the stress performance of the steel-concrete bonding section of the single-tower cable-stayed bridge with mixed beam during the formation and construction stages,the steel-concrete bonding section of the cable-stayed bridge was accurately modeled by the finite element method with the Wenchang West Road cable-stayed bridge as the background,and the stress performance of the key construction sections of the structure was analyzed.The results show that:the overall stress of the steel structure is reasonable,the peak stress appears at the junction of the bearing plate and the steel beam members,and the local stress concentration appears at the corner of the buried steel beam;the existence of the steel plate destroys the integrity of the concrete and reduces its force performance;the longitudinal shear force of the shear nail is distributed in a saddle shape along the longitudinal direction with two large ends and a small middle;the transfer ratio of the bridge deck plate,bearing plate and steel beam is relatively close,and the transfer performance meets the requirements.

关 键 词：钢混结合段 钢纵梁 填充混凝土 剪力钉 传力机理 有限元 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]